Method and apparatus for testing gases.



' F. HABER al n. LEISER.

METHOD AND APPARATUS FOR TESTING GASES.

APPLICATION FILED APR. 30. l9l4. I

Patented June 18. 1918.

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METHOD AND APPARATUS FOR TESTING GASES.

APPLICATION FILED APR. 30. |914.

1 ,269,599.y Patented June 18, 1918.

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METHOD AND APPARATUS TOR TESTlNG GASES. APPLICATION FILED ARR. 30, 1914.y

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Patented June 18, 1918.

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METHOD AND APPARATUS FOR TESTING GASES.

APPLICATION FILED APII.30. I9I4.

l ,269', 599 Patented June 18, l19l8.

4 SHEETS-SHEET 4.

WIT NESSES IN VEN T093 6&4 l F'/ TZ HABER TTOR/VEYS FRITZ HABER, AND RICHARD LEISER, OF BERLIN-DAHLEM, GERMANY.

METHOD AND APPARATUS FOR TESTING GASES.

Specification of Letters Patent. Patented'JllIle 18, 1918.

Application l'ed April 30, 1914. Serial No. 835,419.

To all whom z't may concern.'

Be it known that we, FRITZ HABER, a citizen of Germany, and RICHARD LEisER, a citi-` zen of Austria, both residents of Berlin- Dahlem, Germany, have jointly invented certain new and useful Improvements in Methods and .Apparatus for Testing Gases.

This invention relates to the method of tracing or determining ad'mixtures or variations of compositions of gases by means of the-tone vibrations (beats) of two pipes and has for its object to render the method sim 1er and more expeditiousV and relates flirt er to an apparatus suitable for carrying the method into effect being handy and easy to use especially in mines. V

The following` is a full, clear and exact description, such as will enable others skilled in the art to which it appertains to use the method and make and use the apparatus, reference bein drawingrs in whic Figures 1, 3, 5, 7 and 9 are vertical sections of the entire apparatus, Figs. 2, 4, V6, 8 and 10 cross sections, Fi 7 an elevation partly in section, Fig. 11 a ottom view of a detail of the apparatus, Fig. l2 an elevation of same and the surrounding parts in vertical section and Fig. 18a top view ofthe detail. The three latter figures are dr'awn on a larger scale than the Figs. l to 10.

Fig. 14 is a section on the line lll- 14 of Fig. 15 and represents the upper part of vthe apparatus shown in Fig. 1, and Fig. 15 is a section on the line 15-15 of Fig. 14.

It is known thata chemical impurity of the air can be determined by acoustics, the vibrations (beats) being observed, which are produced by two pipes of the same pitch, when one is blown with the contaminated air and the other with pure air. According to thismethod, however, itis a condition that two gas currents, namely, a current of pure air and a current of contaminated air, are available where the examination is made.' This condition cannot be forming part of this specification,

easily fulfilled so far as an'examination of rent of pure air used for blowing the one pipe is again returned to the storage tank,

had to the accompanying but a porta-ble and handy apparatus is not rendered available in this manner.

The use of two different air currents for blowing the two pipes of the same pitch, which is characterized by the older method can be avoided, as has been proved by experiments. A stopped labial pipe also produces a tone, when an easily adjustable diaphragm is stretched out in the interior of the pipe body and extends transversely to the axis thereof, such 'diaphragm effecting a gastight shutting-olf of a certain part of the pipe body from the remaining part thereof. The said tone depends on the lling or contents of the gas tight shut-oil space of the chamber and becomes deeper or higher during the variation of the said iilling, acco'rding 'as the density of the filling gas undergoes an increase or decrease. The larger the part of the pipe shut-0H by the diaphragm, the more important the variation of the filling gas for the variation of the tone of the pipe. If the diaphragm is stretched closely behind the lip and a gas A is exchanged for a gas vB inthe chamber, the blowing of the pipe with an unvariable gas current will vary the tone almost to the -same extent as when a pipe not provided .with a diaphragm-is blown first with the gas A and then with the gas B. This property or characteristic can be utilized for determining the variation of the composition of a gas with the aid of two pipes, one pipe being. designated the experimental pipe and the other the comparison pipe. The experimental pipe is provided in all ,cases with a artition, which divides its vibration-cham er. For the comparison pipe, such partition` is not fundamentally necessary but is practically advisable. In contradistincltion to former proposals, both pipes are blown with'the same gas current. Care should be taken on accountl of the fact that differences in tem erature of both pipes also have the same eEect as differences in the chemical composition of the gas. Differ- -ences of pressure are not of fundamental but of practical importance, because the pitch of the tone is influenced by a variation in the tension of the partition. If only diii'erences in the chemical composition are to be determined, provision should therefore be made that pressure and temperature in the shutoff gas chamber ot' the experimental pipe have the same values as in the compar1son pipe. The chamber will be combined with a small elastic bag or an open capillary tube will be iiXed to the chamber, said tube being too narrow for allowing of a considerable diusion within the time concerned for the use but insuring pressure equilibrium in the case of variations of the atmospheric pressure and the temperature of the pipes. The partitions, which may be selected, are very manifold. A. caoutchouc diaphragm or any other soft elastic material such aslcollodion or gold-beaters skin may be used. Experiments have shown that hard elastic material, such as mica, may also be used, the partition bein made of a thin elastic plate of such rigi material. The dependency of the pitch of the tone on the gas illing of the shut-od chamber is also maintained when the diaphragm exerts through its own mass and elastically a positive influence on the absolute pitch of the tone oi the pipes.

For the special case of tracing mine-gas in the mine, the pipes arepre'ferably used in such a manner that a small quantity oi ordinary atmospheric air is carried in the chamber of the experimental pipe, while mineair from the place where the examination is made is passed into the chamber of the comparison pipe, after having withdrawn, through the medium of suitable absorbing apparatus the Varying quantities of carbonic acid and steam. The mine-air with or without the removal ot carbonio acid and steam is used 'for blowing both pipes. The number ot vibrations (beats) ot the pipes then indicates the contents of methane. in the same sense as an increase of the methane, a decrease of the oxygen and increase oi the nitrogen in the air acts on the apparatus but the sensitiveness tor this variation is` much less. lf it is intended to examine mineair as to carbonio acid, the chamber of one pipe is iilled with the dried mine-air not freed from carbonio acid, while the chamber ot' the other pipe is lled with mine-air, from which steam and carbonic acid have been withdrawn.4 v

For determining admintures and varian tions of composition in gases in other cases the instrument is used in a similar manner.

rlhe quantitative determination of 'the ditterence of composition is attained in the following manner. A device is provided on one of the two pipes tor varying its length and the variation, which one must make in order to eliminate the vibrations, is read ofi' an empirically calibrated scale.

it the method is employed in order to trace or determine admixtures or variations oi composition oi gases especially in mines by means of a portable apparatus, the circumstance that the pitch o the two pipes tends to vary irregularly with the pressure of the blowing gas current is a drawback. This `'aiiation in the inuence of the blow- Lacasse ing pressure on the pitch is characterized by the distinctive feature that the two pipes produce a dierent number of vibrations per unit of time when the pressure of the blowing gas current. is different.

According to the invention, this drawback will be obviated when the pipes are made long and an overtone is blown by the single air or gas current, provision being simultaneously made for equalizing the irregular influence of the blowing strength on the pitch of the two pipes. This is preferably effected in such a manner that the 4width of the blowing gap or the gas passage leading thereto is adapted to be Varied for the one pipe or for both pipes by the provision of throttling means. By a suitable adjustment thereof, the effect is attained that the two pipes, when sounding in unison at a certain strength of the blowing current or making a certain number of vibrations (beats) also maintain these qualities in connection with the practically concerned variations of the pressure of the blowing current.

ln some cases, it is suiiicient, instead of the throttling provided for in the two branch pipes, to let the blowing air current, which is the same for both pipes, pass through a pressure regulator, behind which the air current branches cti to the two pipes.

Since the pressure regulators, which are adapted to be fitted in a handy apparatus for rire-damp indicators, are frequently not suiiicient for completely removing the variations ot the blowing current, it is advisable le@ to proyide, besides the pressure regulator, also the above-mentioned means, c'. e. the '-throttling oi the gas current in one or two branch pipes leading to the pipes.

in apparatus adapted to serve in the de- W5 scribed manner for tracing or determining admixture's or variations of composition in gases and especially in mine-air by tone vibrations (beats) is shown in the accompanying drawings. T he essential parts of the apparatus are the bot-tom piece l and thc top piece 2, which are formed, :for instance, of aluminium or brass. ln the latter are the two pipes (whistles) 3 and l with the lips 6 and U5 T. Behind the lips are arranged the diaphragme 8 and 9 consisting, for instance, of mica. lin the bottom piece 1 are the bores 10 and l1 serving as pipe tubes for the pipes 3 and l. In the pipe tube 1() is secured a 120 narrower' tube 1Q and in the pipe tube 11 n narrower tube 13. These narrower tubes 12 and 13 are open close to the diaphragms and closed at the other end. A bore 1l is also provided in the bottom piece l. serves as cylinder Jfor the piston 15 larried by the piston rod 16. The latter is secured in the cover 1T screwed on to the sleeve 18. rEhe packing collars 19 arranged on the lowersurface of the bottom piece l bear air- 130 tight against the inner wall of the sleeve 18.

In order to facilitate the handling of the apparatus during use, a sleeve 20 is provided, which is secured on the top piece 2 by countersunk screws.

In the bottom piece l are two bores 21 and 22, in which two metal tubes 23 and 24 are inserted, which have perforatedl bottoms. These tubes, hereinafter -designated cartridges, are filled with chemicals, such as soda lime, which are adapted to absorb steam and carbonio acid. The chemicals do not iill the cart-ridges completely, so that space is left above same for receiving dust-retentive substances, such as cotton wool or glass wo'ol. The cartridges 23 and 24 are mounted on caoutchouc .rings 25. The bores 21 and 23 are adjoined by short narrower bores 26 and 27.

There is also a bore 28 in the bottom piece 1 and the passage 29, which extends partly in the bottom piece 1 and partly inthe top piece 2 communicates with the said bore 28.

From the bottom side of the bottom piece 1 reaches further the bore 30, which contains the device for tuning the pipes and which is extended in the bore 31. The bore 32 corresponds thereto, which is in the top piece 2.

The bore 34 in the top piece 2 corresponds to the bore 33 in the bottom piece 1.

The bore 35 extends through the bottom piece 1I and the top piece 2.

A further axially directed'bore 36 in the bottom piece 1 extends in the bore 37 in the topI piece 2.

The bottom piece 1 is provided with a very wide but not deep groove 38, in which is provided a capillary tube 39 (thin brass tube). The capillary tube 39 is covered by a tube 40 slipped over same and secured to the bottom piece 1. The one end of the capillary tube 39 communicates at 41 with the ltube 13 in thepipe tube 11. It is .inserted through the bore 42 provided in the bottom piece 1 and soldered and calked. The other end of the capillary tube is secured at 43 in a small passage 44 of the bottom piece 1 in the same manner. A. bore 45 extends from the passage 44 through the bottom piece l and the top piece 2.

(,ommunication is established between the pipe tube 10 and the bore 28 by the small bore 46.

The bore 47 connects the tube y12 in the pipe tube 10 and the bore 27 below the cartridge 24. v

The bore 48 communicates with the pipe tube 11 at the bottom and leads to the bore 33.

The bore 49 leads from the bore 36 to the bore 26 below the cartridge 23.

The bore 33 is shut ofi by a screw 50. This screw is bored transversely and also partly longitudinally, so that air can pass through the passage 34 through the screw into the bore 33 when the screw has been' turned back a few threads.

There is provided in the bore 30 a cylindrical block 51 on which a spring 52 acts. In the block 51 a thread 53 is cut with which the spindle 54 engages. The latter is secured in position by means of a groove 55 in which the end of the screw. 56 extends. There is also a screw 57 secured in the block 51, such screw reaching with its extension 58 through the longitudinal hole 59 and acting on the cylinder 60 adapted'to slide in the pipe tube 12. The cylinder 60V is provided at its lower end with a small slot 61, so that it cannot close the bore 46 in its lowest position-it embraces the tube 12 with play.

The pipes 3 and 4 are surrounded in the top piece 2 by hollow spaces or cavities 62 Aand 63, which with the sound openings or apertures communicate with the open air. They are'of such dimensions that they act as resonators and cause the pipes when blown to immediately emit the overtone.

The diaphragms 8 and 9 are mounted on. caoutchouc rings 66 and are secured thereon for instance by glycerin.

The -two bores 29 and 37 -communicate with each other through a transverse bore 67. The short vert-ical bore 68 communicates with the bore 67. The bore 68 communicates with the valve chamber 69.

The top piece 2 is also provided with the two bores 70 and 71, the bore 7 2 and the bore 73 leading to the valve chamber 69.

The head plate 75 is mounted on the top piece 2. The screws 76 and 77 are provided in the head plate 75. The pin-shaped extensions of the screws 76 engage in the bores 70 and 71 `in the top piece 2.

There is also formed in the head plate 7 5:

the passage 78, which leads from the valve chamber 69 to the bore 35.

In the head plate 75 bores are provided corresponding to the bores 23, 24, 32, 34, 45 and 74 in the top piece 2.

The cover 79 with the two apertures 80 is mounted on the head plates 75. The cartridges 23 and 24, for which the bores 81 and 82 are provided in the head plate, are se- .'cured in position by the cover 79.

The valve body 83 is provided in the valve chamber 69. The valve body 83 carries two. valves 84 and 85, which are arranged over the apertures 86 and 87. The valves consist in well known manner of small metal plates secured to plate springs. The aperture 86 in the valve carrier 83 communicates with the bore 68 in the top piece 2. The conical abutment of the screw 77 extends into the aperture 87.

As is shown in the accompanying drawings, the bores are closed at their ends in known manner by screw plugs. The top piece 2 is secured to the bottom piece 1 by 130 countersunk screws. rlhe head plate 75 is secured to the top piece 2 in the same mans ner. The cover 7 9 `is screwed on to the head plate 75.

The described apparatus operates in the following manner:

lf the sleeve 18 is drawn out of the sleeve 20, two courses can be followedby the air for entering the vacuum chamber formed in the interior of the sleeve 18. One course is the following: through one of the holes 80 in the cover 79, through the cartridges 23, the bores 26, 19, 36 and 37 to the transverse bore G7. The second course leads through the other hole 80 in the cover 7 5, the cartridge 24 and the bores 27, 17, the

tube 12, the pipe tube chamber 10, through the bores L16, 28 and 29, the latter communicating with the transverse bore 67. The bore 67 leads to the bore 68 communicating with the hole 8G in the valve carrier 83. The valve 8l is opened, because partial vacuum is behind the same. The valve 85 is subjected to suction for the same reason and closes the aperture 87. The 'gas or air currents passing through the two cartridges 23 and 2l and meeting again in the transverse passage 67 consequently pass the valve 8a, pass into the passage 78 of the head plate 75 and finally reach through the bore 35 the suction chamberv within the sleeve 18.

'When drawing out the sleeve 18, vacuum is created through the piston 15 in the cylindrical bore 14.-, so that when releasing the sleeve 18, the latter is again returned to the original position by the pressure of the atmosphere. The air of the surroundings drawn in the sleeve 18, is now forced through the bore 35 and the passage 78 to the valve chamber 69, whereby the valvev 8a is closed and the valve 85 is opened. lllhe air passes through the bores 73, 72, 70 and 7l into the pipes (whistles) 3 and 4 and causes same to produce a' sound.

The pipe tube 11 is filled with the comparison-gas, such as pure air, and for the above-mentioned reasons, it communicates with the surroundings. The communication is established by the tube 13, the bore 41, the capillary tube 39, the passage 4a, the bore 15 and the two bores 7&1.

From time to time, perhaps every week,

the cover 79 is removed, the screw 50 loosened and a suction device connected to the passage 45. There is placed in front of the passage 34 a dust filter and a receptacle containing soda lime, so that dry air freed from carbonio acid and dust is drawn in the cap illary tube 39 and the pipe tuloe 11.

The tuning of the two pipes (whistles) 3 and a takes place after removing the cover 79 by turning the spindle 54, whereby the block 51 and the cylinder 60 are adjusted. lf the cylinder is moved upward, the tone of the pipe will be of higher pitch and if Laeaaae The extensions of the screws 76, which reach into the branch passages 70 and 71, allow of a thottling in these passages, whereby the pressure of the blowing gas or air current for the two pipes can be Varied somewhat, so that it is possible to render the increase of the pitch of the tone equivalent to the blowing pressure of both pipes, because this increase varies with a certain pipe for different pressures.

During the suction by drawing out the sleeve 18, two ways are provided for the inflowing gas or air in order that the whole quantity of gas` or air required for blowing need not be drawn through the pipe tube 10, so that the suction can take place slowly through the pipe tube 10. Over-pressure or partial vacuum is avoided in the tube and nevertheless suliicient gas or air is available for blowing the pipes.

If a gas pressure regulator is used, the head plate 75 may be replaced by a similar head having thereon a ressure regulator of the` usual or any preferred type. In this case' the passage 78 does not communicate with the valve chamber 69 but only with the pressure regulator and a pipe leads from the regulator into the valve chamber 69. The throttle screw 77 can then be dispensed with. Instead of strangling the blast of air at the aperture 87 it can be permitted to flow through a pressure regulator which maintains the pressure in the bores 70 and 71 constant until the end of the blast. r1`his pressure regulator is shown in Fig. 14. Between the top piece already described and the head )late 75 is provided an intermediate mem er 88 having a recess 89 in which are located rings 90 and 91. 1n the recess 89 are also located the valve body 83 land the main portion of the pressure regulator. A membrane 92 of goldbeaters skin is streached across the recess 89 and held in place between the rings 90 and 91. On each side of this membrane and at the central portion thereof are-clamped two plates 93. 1n the head piece 2 is formed an elongated opening 97 with which the hores 70 and 71 leading from the pipes 3 and l communicate. A. opening 97 and has one end secured to the spring 95 and the other end secured to the plates 93 above mentioned. The flats ring 95 normally tends to press the me Erane lever 94.- is located in the elongated' 92 downwardly. The lever 94 also acts as a closure valve for the nozzle 96. Screws 76 are located in the top iece 2 and act to strangle the bores 7 0 and 1. The strangling screw 77, also the bore 72 shown in Fig. l, are here eliminated. The bore 98 connects the recess over the membrane with the outside air.

On blowing the pipes the air from the pump passes through the bore 78, the valve 85l and the nozzle 96 in the recess below the membrane 92, producing a gas pressure which increases until the membranel overcomes the force of the spring 95 and pulls lever 94 upwardly. By this action the lever automatically closes the nozzle 96'so that the pressure in the room 97 equals the pull of the spring. A constant blast is thus maintained in the piges. I Y

he dimensions of theapparatus are/such that with drawn-in sleeve 18, the whole length is about 9 and the diameter is about 27,1.

We claim:

l. The method of tracing or determining admixtures or variations of composition of gases by means of tone vibrations which -consists in confining portions of the gases to be compared in separate chambers closed by diaphragms then producing tone vibrations in front of each of. said diaphragms and comparing-the resultant tones.

2. The method of tracing or determining admixtures or variations of composition of gases by means of tone vibrations which consists in taking samples of the twogases conning them in separate chambers each with an elastic wall then producing tone vibrations against the elastic walls of both chambers and comparing the resultant tones.

3. The method of `tracing or determining admiXtures or variations of composition of gases by means of tone vibrations which oonsists in conining samples of the gases to be compared in separate chambers one wall lof eachchamber comprising an elastic diaphragm, then simultaneously passing tone producing currents of one of the gases in front of both of said diaphragms and comparing the resultant tones.

4. The method of tracing or determining admixtures or variations of composition of gases by means of tone vibrations which consists in confining a sample of a standard gas in a tubular chamber one'end wall of which is an elastic diaphragm, introducing a sample of the gas to be tested into a similar lchamber with a diaphragm.then setting up tone vibrations in front of said diaphragme and comparing the resultant tones.

5. The method cf tracing or determining admixtures or variations of composition of gases by means of tone vibrations ywhich consists in coniining samples of the gases to be comparedin separate tubular chambers, one wall of each chamber comprising an elastic said diaphragm shuttin diaphragm then blowing currents of one of the gases past said diaphragm thereby producing tone vibrations adapted to be affected by the confined gases back of the dia-v phragms, and comparing the resultant tones.

6. The method of tracing or determining admixtures or variations of composition of gases by means of tone vibrations which consists in conningsamplesof the gases to be admiXtures or variations of composition of gases by means of tone vibrations which 'consists in confining samples of the gases to be compared in separate adjoiningchambers each provided with an elastic diaphragm wall, then simultaneously producing musical tones in front of' said diaphragms and comparing the tones produced by counting the beats. v

8. The method of tracin ordetermining admixtures orvariations o composition of gases by means of tone vibrations which consists in conlining samples of the gases to be compared in separate chambers each provided with an elastic diaphragm wall then passing currents of one of the gases in front of the respective diaphragms to produce tone vibrations, the respective currents being throttled or controlled tovary the tone vibrations, and comparing the tone effect of the confined gases.

9. In an apparatus for tracing or determining admixtures or variations of composition of gases by means of the tone vibra-y tions of two pipes,'the combination of two pipes mounted in coperative relation, one of said pipes being adapted to contain a standard gas, means in the lip ends of said pipes for producing tone vibrations by currents of gas, a gas tight diaphragm stretched transversely of the axis of one of said pipes, off the rear part of the pipe body from t e part close to the lip, and means for blowing said pipes tov producev tone vibrations. U

10. ln an apparatus fortraclng or determining admixtures or variations of compo-rv transversel of the axis of each of said pi es said diaphragm shutting on' the rear parts lof the respective pipe bodies from the parts next to the lips, and means for blowing said pipes to produce tone vibrations.

11. In an apparatus for tracing or determinin admiXtures or variations of composition oi gases by means of the tone vibrations of two pipes, the combination of two pipes mounted in cooperative relation, one of said pipes being adapted to contain a standard gas, means in the lip ends of said pipes 'for producing tone vibrations by currents of gas, a gas tightdiaphragm stretched transversely of the` axis of one of said pipes said ldiaphragm shutting oii the rear part of the pipe body from the part close to the lip, and a single feed passage adapted to supply gas for blowingboth of saidpipes to produce to ie vibrations.

l2. In an apparatus for tracing or determining admiXtures or variations of composition of gases by means of the tone vibrations of two pipes, the combination of two pipes mounted in cooperative relation, one of said pipes being adapted to contain a standard gas, means in the lip ends of said pipes for producing tone vibrations by currents of gas, a gas tight diaphragm stretched transversely of the axis of one of said pipes said diaphragm shutting oi the rear part of the pipe body from the part close to the lip, a single feed passage adapted to supply gas for blowing both or said pipes to produce tone vibrations and means for throttling said passage.

13. In an apparatus for tracing or Idetermining admixtures or variationsoit composition of gases by means of the tone vibrations oi? two pipes, the combination of two pipes mounted in coperative relation, one or said pipes being adapted to contain a standard gas, means in the lip end or said pipes for producing tone vibrations by currents of gas, a gas tight diaphragm stretched transversely of the axis oi One of said pipes said diaphragm shutting of? the rear part of the pipe body from the part close to the lip, a single feed passage adapted to supply gas for blowing both or said pipes to produce tone vibrations and means for regulating the pressure or the blowing gas.

la. In an apparatus for tracing or determining Vadmiirtures or variations of c oniposition of gases by means oi the tone vibrations of two pipes, the combination or. two pipes mounted in coperative relation, one oi said pipes being adapted to contain a standard gas, means in the lip ends of said pipes "for producing tone vibrations by currents off gas, a as tight diaphragm stretched transverseiy o the airis or one oi" said pipes said diaphragm shutting off the rear part oi the pipe body from the part close tothe lip, a single feed passage adapted to supply gas for blowing both or said pipes to produce tene vibrations, branches leading from said passage to the respective pipes and ipeaee means in each branch for throttling the same.

15. In an apparatus for tracing or determining admixtures or variations of composition of gases by means of the tone vibrations of two pipes, the combination of two pipes mounted in cooperative relation, one of saidpipes being adapted to contain a standard gas, means in the lip ends of said pipes for producing tone Vibrations by currentsof gas, a fgas tight diaphragm stretched transversely o the axis of one of said pipes said diaphragm shuttin 'off the rear part of the pipe body from tIx lip, a single feed passage adapted to supply gas for blowing both of said pipes to produce tone vibrations, means for regulating the pressure of the blowing gas, branches leading Jfrom said passage to the respective pipes and means for throttling each branch.

16. In anapparatus for tracing or determining admixtures or variations of'composition of gases by means of the tone ,vibrations of two pipes, the combination of two pipes mounted in coperative relation, one oi said pipes being adapted to contain a standard gas, means in the lip ends of said pipes for producing tone vibrations by currents or gas, a gas tight diaphragm stretched transversely of the axis of one of said pipes, said'diaphragm shutting off the rear part of the pipe body rom the part close to the lip, a single teed passage adapted to supply gas for blowing both of said pipes to produce tone vibrations, branches leading from said passage to the respective pipes, means for lthrottling said passage, means Jfor throttling eachop said branches and a capillary tube having one end in open communication with theu air and the other end connected with one oi said pipes.

17. In an apparatus for tracing or determining admiiitures or variations or composition o gases by means or .the tone vibrations oi 'two pipes, the combination of two pipes mounted in cooperative relation, one or said pipes adapted to contain a standard gas, means in the lip ends oi"- said pipes or producing tone vibrations by currents ci2 gas, a gas tight diaphragm stretched transversely or the airis or' one oi said pipes, said diaphragm shutting oid the rear part of the pipe body trom the part close to the lip, a single reed passage adapted to supply gas for blowing both of said pipes to produce tone vibrations, branches leading from said passage to the respective pipes, means ir'or throttling said passage, means for throtw tling each or" branches and resonators for producing the desired overtones in said pipes.

18. In an apparatus for tracing or deteru mining admixt'ures or variations of composition o gases by means of the tone vibrations of two pipes, the combination of twov e part close to the les pipes mounted in coperative relation, one of said pipes being adapted to contain a standard gas, means in the lip ends of said pipes for producing tone vibrations by currents of gas, a gas tight diaphragm stretched transversely of the'axis of one of said pipes, said diaphragm shutting off the rear part of the pipe body from the part close to the lip, a single feed passage adapted to supply gas `for blowing both of said pipes to produce tone vibrations, branches leading from said passage to the respective pipes, means for throttling said passage, means for throttling each of vsaid branches, means for clean ing the blowing gas and a device for the suction of the latter.

19. In an apparatus for tracing or determining admixtures or variations of compo-` sition of gases by means of the tone vibrations of two pipes, the combination of two pipes mounted in coperative relation, one of said pipes being adapted to contain a. standard gas, means in the lip ends of said pipes for producing tone vibrations by currents of gas, a gas tight diaphragm stretched transversely of the axis of one of said pipes, said diaphragm shutting oli the rear part of the pipe body from the part close to the lip, a single feed passage adapted to supply gas for blowing both oi said pipes to produce tone vibrations, branches leading from said passage to the-respective pipes, means for throttling said`passage, means for throttling. each or" said branches, cartridges for cleaning the blowing gas, a device for the suction of the latter, a cylinder, and a piston `therein adapted to be secured'. to said suction device. 4

20. in an apparatus :tor tracing or determining admiXtures or variations of compotion or gases by means of the tone vibrations o two pipes, the combination of two pipes mounted in cooperative relation, one oi .Said pipes being adapted to contain a standard gas, means in the lip-ends or" said pipes for producing tone vibrations by currents of gas, a gas tight diaphragm stretched transversely of the axis of one oi"- said pipes, said diaphragm shutting ed the rear part of the pipe body :trom the part close to the lip, a 'single :feed passage adapted to supply gas for blowing both of said pipes to produce tone vibrations, branches leading from said passage to the respective pipes, means for throttlingsaid passage, means tor throttling each et said branches, cartridges for cleaning the blowing gasfa device :tor the suction of the latter, a cylinder, a piston therein adapted to be `secured to said suction device, and means in one er said pipes ier equalizing the tone pitch of the pipes.

2l. En an apparatus :tor tracing or determining admixtures or variations or1 composition oi gases by means of the 'tone vibrations of two pipes, the combination of two pipes throttling. said passage, means for throttling each of said branches, cartridges for cleaning the blowing gas, a device for the suction of the latter, a cylinder, a piston therein adapted to be secured to said suction device, means in one of said pipes for equalizing the tone pitch pf the pipes and a ca illary tube v connected at one end with one o said pipes, the other' end of the tube being open.

22. ln an apparatus for tracing or determining admixtures or variations of composition of gases by means of the tone vibrations of two pipes, the combination of two pipes mounted in cooperative relation, one of said pipes being adapted to contain a standard gas, means in the lip ends of said pipes for producing tone vibrations by currents of gas, a gas tight diaphragm stretched transversely of the axis of one ot said pipes, said diaphragm shutting ed the rear part of the pipe bodyfrom the part close to the lip, a 'single feed passage adapted to supply gas 'for blowing both ci said pipes to produce tone vibrations, branches leading from said passage to the respective pipes, means. for throttling said passage, means for throttling each of said branches, cartridges tor cieaning the blowing gas, a device for the suction y of the latter, acylinder, a piston therein 'adapted to be secured to said suction device, means in one of said pipes for equalizing the tone pitch of the pipes, a capiiiary tube connected at one end with one of said pipes, the other end of the tube being open and resonators for producing desired overtones in said pipesn 23. iin an apparatus-tor traci or determining admintures or variations o compos? 'tion of gases by means ci the tone vibration o2 two pipes, the combination ci? tvvo pi mounted in cooperative relation, one c"I sg pipes being to contai gas, means in the iip ends of producing tene vibrations gas, a gas tight diaphragm sa verseiy or' the anis or one et said pipes, said diaphragm shutting ci? the rear part of the pipe body from the part close te the lip, a singie feed passage adapted te supply gas for blowing both of said pipes to produce tone vibrations, branches leading from said passage to the respective pipes, means for throttling said passage, means for throttlingV nir each of said branches, cartridges for cleaning the blowing gas, a device for the suction of the latter, a cylinder, a piston therein adapted to be secured to said suction device, means in one of said pipes for equalizing the tone pitch of the pipes, a Capillary tube connected at one end With one of said pipes, the other end of the tube being open, resonators for producing thev desired overtones in said pipes and means for admitting to said pipe having the connected Vcapillary tube fresh gas for comparison.

24. In an apparatus for tracing or determining admixtures or variations of composition of gases by means of the tone vibrations (beats) of two pipes, a stopped labial pipe containing aithin elastic plate of vgas-tight and hard material placed transversely to the axis of the pipe body and shutting'o the rear part of the pipe body from the part close to the lip and means for introducing into the rear part of the pipe back of Lacasse the elastic plate, gaseous mixtures to be tested.

25. ln an apparatus for tracing or determining admiXtures or variations of composition of gases by means of the tone vibrations (beats) of two pipes, a stopped labial pipe containing a thin elastic plate of mica placed transversely to the axis of the pipe body and shuttingoi the rear part of the pipe body from the part close to the lip and means for introducing into the rear part of the pipe, back of the elastic plate, gaseous mixtures to be tested.

In testimony whereof, We have hereunto set our hands in the presence of two sub scribing Witnesses this 20th day of April,

FRITZ HABER. i RICHARD LESER. Witnesses:

`VVOLDEMAR HAUPT,

HENRY HASPER. 

